Answer:
D. I have had the unique opportunity to observe first-hand some of the differences between the environment of a free river and a power-plant reservoir.
Explanation:
In this question, the clearest example of ethos occurs in option D. This relates to the text "The Dam-nation of a Canyon." Ethos refers to an appeal to authority. This occurs when an author tries to persuade the audience of an opinion by appealing to his own credentials. In this example, this is what occurs in option D, as the author tells us that he has had the opportunity to observe first-hand some of the differences between the environment of a free river and a power-plant reservoir.
The excerpt which shows the clearest example of ethos is: "I have had the opportunity to observe first-hand some of the differences between the environment of a free river and a power-plant reservoir."
A persuasive essay can be defined as a type of essay in which the aim of a writer is to convince the readers (audience) to accept his own point of view, perspective, ideas or opinions.
In English language, the three modes of persuasion in a rhetorical situation are:
Basically, ethos refers to the emotions or character of a writer that are expressed so as to persuade an audience to accept a specific point of view, perspective, ideas or opinions.
Read more on ethos here: https://brainly.com/question/13118125
